<!DOCTYPE html>
<html>

	<head>
		<meta charset="UTF-8">
		<title></title>
		<style type="text/css">
			*{
				padding: 0;
				margin: 0;
				margin-top: 0;
			}
			.toubu_box {
				width: 1000px;
				height: 400px;
				margin: 0 auto;
				background-color: aquamarine;
			}
		</style>
	</head>

	<body>
		<div class="toubu_box">
			中间
		</div>
	</body>

</html>